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| -rw-r--r-- | include/iprt/list-off32.h | 514 |
1 files changed, 514 insertions, 0 deletions
diff --git a/include/iprt/list-off32.h b/include/iprt/list-off32.h new file mode 100644 index 00000000..69a4efcf --- /dev/null +++ b/include/iprt/list-off32.h @@ -0,0 +1,514 @@ +/** @file + * IPRT - Generic Doubly Linked List, using 32-bit offset instead of pointers. + */ + +/* + * Copyright (C) 2010-2022 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + +#ifndef IPRT_INCLUDED_list_off32_h +#define IPRT_INCLUDED_list_off32_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <iprt/types.h> + +/** @defgroup grp_rt_list_off32 RTListOff32 - Generic Doubly Linked List based on 32-bit offset. + * @ingroup grp_rt + * + * This is the same as @ref grp_rt_list , except that instead of pointers we use + * 32-bit offsets. The list implementation is circular, with a dummy node as + * anchor. Be careful with the dummy node when walking the list. + * + * @{ + */ + +RT_C_DECLS_BEGIN + +/** + * A list node of a doubly linked list. + */ +typedef struct RTLISTOFF32NODE +{ + /** Offset to the next list node, relative to this structure. */ + int32_t offNext; + /** Offset to the previous list node, relative to this structure. */ + int32_t offPrev; +} RTLISTOFF32NODE; +/** Pointer to a list node. */ +typedef RTLISTOFF32NODE *PRTLISTOFF32NODE; +/** Pointer to a const list node. */ +typedef RTLISTOFF32NODE const *PCRTLISTOFF32NODE; +/** Pointer to a list node pointer. */ +typedef PRTLISTOFF32NODE *PPRTLISTOFF32NODE; + +/** The anchor (head/tail) of a doubly linked list. + * + * @remarks Please always use this instead of RTLISTOFF32NODE to indicate a list + * head/tail. It makes the code so much easier to read. Also, + * always mention the actual list node type(s) in the comment. + * @remarks Must be allocated in a similar manner as the nodes, so as to + * keep it within a 32-bit distance from them. + */ +typedef RTLISTOFF32NODE RTLISTOFF32ANCHOR; +/** Pointer to a doubly linked list anchor. */ +typedef RTLISTOFF32ANCHOR *PRTLISTOFF32ANCHOR; +/** Pointer to a const doubly linked list anchor. */ +typedef RTLISTOFF32ANCHOR const *PCRTLISTOFF32ANCHOR; + + +/** + * Initialize a list. + * + * @param pList Pointer to an unitialised list. + */ +DECLINLINE(void) RTListOff32Init(PRTLISTOFF32NODE pList) +{ + pList->offNext = 0; + pList->offPrev = 0; +} + +/** + * Internal macro for converting an offset to a pointer. + * @returns PRTLISTOFF32NODE + * @param a_pNode The node the offset is relative to. + * @param a_off The offset. + */ +#define RTLISTOFF32_TO_PTR(a_pNode, a_off) ((PRTLISTOFF32NODE)((intptr_t)(a_pNode) + (a_off))) + +/** + * Internal macro for getting the pointer to the next node. + * @returns PRTLISTOFF32NODE + * @param a_pNode The node the offset is relative to. + */ +#define RTLISTOFF32_NEXT_PTR(a_pNode) RTLISTOFF32_TO_PTR(a_pNode, (a_pNode)->offNext) + +/** + * Internal macro for getting the pointer to the previous node. + * @returns PRTLISTOFF32NODE + * @param a_pNode The node the offset is relative to. + */ +#define RTLISTOFF32_PREV_PTR(a_pNode) RTLISTOFF32_TO_PTR(a_pNode, (a_pNode)->offPrev) + +/** + * Internal macro for converting an a pointer to an offset. + * @returns offset + * @param a_pNode The node the offset is relative to. + * @param a_pOtherNode The pointer to convert. + */ +#define RTLISTOFF32_TO_OFF(a_pNode, a_pOtherNode) ((int32_t)((intptr_t)(a_pOtherNode) - (intptr_t)(a_pNode))) + +/** + * Internal macro for getting the pointer to the next node. + * @returns PRTLISTOFF32NODE + * @param a_pNode The node which offNext member should be set. + * @param a_pNewNext Pointer to the new next node. + */ +#define RTLISTOFF32_SET_NEXT_PTR(a_pNode, a_pNewNext) \ + do { (a_pNode)->offNext = RTLISTOFF32_TO_OFF(a_pNode, a_pNewNext); } while (0) + +/** + * Internal macro for getting the pointer to the previous node. + * @returns PRTLISTOFF32NODE + * @param a_pNode The node which offPrev member should be set. + * @param a_pNewPrev Pointer to the new previous node. + */ +#define RTLISTOFF32_SET_PREV_PTR(a_pNode, a_pNewPrev) \ + do { (a_pNode)->offPrev = RTLISTOFF32_TO_OFF(a_pNode, a_pNewPrev); } while (0) + + + +/** + * Append a node to the end of the list. + * + * @param pList The list to append the node to. + * @param pNode The node to append. + */ +DECLINLINE(void) RTListOff32Append(PRTLISTOFF32NODE pList, PRTLISTOFF32NODE pNode) +{ + PRTLISTOFF32NODE pLast = RTLISTOFF32_PREV_PTR(pList); + RTLISTOFF32_SET_NEXT_PTR(pLast, pNode); + RTLISTOFF32_SET_PREV_PTR(pNode, pLast); + RTLISTOFF32_SET_NEXT_PTR(pNode, pList); + RTLISTOFF32_SET_PREV_PTR(pList, pNode); +} + +/** + * Add a node as the first element of the list. + * + * @param pList The list to prepend the node to. + * @param pNode The node to prepend. + */ +DECLINLINE(void) RTListOff32Prepend(PRTLISTOFF32NODE pList, PRTLISTOFF32NODE pNode) +{ + PRTLISTOFF32NODE pFirst = RTLISTOFF32_NEXT_PTR(pList); + RTLISTOFF32_SET_PREV_PTR(pFirst, pNode); + RTLISTOFF32_SET_NEXT_PTR(pNode, pFirst); + RTLISTOFF32_SET_PREV_PTR(pNode, pList); + RTLISTOFF32_SET_NEXT_PTR(pList, pNode); +} + +/** + * Inserts a node after the specified one. + * + * @param pCurNode The current node. + * @param pNewNode The node to insert. + */ +DECLINLINE(void) RTListOff32NodeInsertAfter(PRTLISTOFF32NODE pCurNode, PRTLISTOFF32NODE pNewNode) +{ + RTListOff32Prepend(pCurNode, pNewNode); +} + +/** + * Inserts a node before the specified one. + * + * @param pCurNode The current node. + * @param pNewNode The node to insert. + */ +DECLINLINE(void) RTListOff32NodeInsertBefore(PRTLISTOFF32NODE pCurNode, PRTLISTOFF32NODE pNewNode) +{ + RTListOff32Append(pCurNode, pNewNode); +} + +/** + * Remove a node from a list. + * + * @param pNode The node to remove. + */ +DECLINLINE(void) RTListOff32NodeRemove(PRTLISTOFF32NODE pNode) +{ + PRTLISTOFF32NODE pPrev = RTLISTOFF32_PREV_PTR(pNode); + PRTLISTOFF32NODE pNext = RTLISTOFF32_NEXT_PTR(pNode); + + RTLISTOFF32_SET_NEXT_PTR(pPrev, pNext); + RTLISTOFF32_SET_PREV_PTR(pNext, pPrev); + + /* poison */ + pNode->offNext = INT32_MAX / 2; + pNode->offPrev = INT32_MAX / 2; +} + +/** + * Checks if a node is the last element in the list. + * + * @retval true if the node is the last element in the list. + * @retval false otherwise + * + * @param pList The list. + * @param pNode The node to check. + */ +#define RTListOff32NodeIsLast(pList, pNode) (RTLISTOFF32_NEXT_PTR(pNode) == (pList)) + +/** + * Checks if a node is the first element in the list. + * + * @retval true if the node is the first element in the list. + * @retval false otherwise. + * + * @param pList The list. + * @param pNode The node to check. + */ +#define RTListOff32NodeIsFirst(pList, pNode) (RTLISTOFF32_PREV_PTR(pNode) == (pList)) + +/** + * Checks if a type converted node is actually the dummy element (@a pList). + * + * @retval true if the node is the dummy element in the list. + * @retval false otherwise. + * + * @param pList The list. + * @param pNode The node structure to check. Typically + * something obtained from RTListOff32NodeGetNext() + * or RTListOff32NodeGetPrev(). This is NOT a + * PRTLISTOFF32NODE but something that contains a + * RTLISTOFF32NODE member! + * @param Type Structure the list node is a member of. + * @param Member The list node member. + */ +#define RTListOff32NodeIsDummy(pList, pNode, Type, Member) \ + ( (pNode) == RT_FROM_MEMBER((pList), Type, Member) ) +/** @copydoc RTListOff32NodeIsDummy */ +#define RTListOff32NodeIsDummyCpp(pList, pNode, Type, Member) \ + ( (pNode) == RT_FROM_CPP_MEMBER((pList), Type, Member) ) + +/** + * Checks if a list is empty. + * + * @retval true if the list is empty. + * @retval false otherwise. + * + * @param pList The list to check. + */ +#define RTListOff32IsEmpty(pList) ((pList)->offNext == 0) + +/** + * Returns the next node in the list. + * + * @returns The next node. + * + * @param pCurNode The current node. + * @param Type Structure the list node is a member of. + * @param Member The list node member. + */ +#define RTListOff32NodeGetNext(pCurNode, Type, Member) \ + RT_FROM_MEMBER(RTLISTOFF32_NEXT_PTR(pCurNode), Type, Member) +/** @copydoc RTListOff32NodeGetNext */ +#define RTListOff32NodeGetNextCpp(pCurNode, Type, Member) \ + RT_FROM_CPP_MEMBER(RTLISTOFF32_NEXT_PTR(pCurNode), Type, Member) + +/** + * Returns the previous node in the list. + * + * @returns The previous node. + * + * @param pCurNode The current node. + * @param Type Structure the list node is a member of. + * @param Member The list node member. + */ +#define RTListOff32NodeGetPrev(pCurNode, Type, Member) \ + RT_FROM_MEMBER(RTLISTOFF32_PREV_PTR(pCurNode), Type, Member) +/** @copydoc RTListOff32NodeGetPrev */ +#define RTListOff32NodeGetPrevCpp(pCurNode, Type, Member) \ + RT_FROM_CPP_MEMBER(RTLISTOFF32_PREV_PTR(pCurNode), Type, Member) + +/** + * Returns the first element in the list (checks for empty list). + * + * @retval Pointer to the first list element. + * @retval NULL if the list is empty. + * + * @param pList List to get the first element from. + * @param Type Structure the list node is a member of. + * @param Member The list node member. + */ +#define RTListOff32GetFirst(pList, Type, Member) \ + ((pList)->offNext != 0 ? RTListOff32NodeGetNext(pList, Type, Member) : NULL) +/** @copydoc RTListOff32GetFirst */ +#define RTListOff32GetFirstCpp(pList, Type, Member) \ + ((pList)->offNext != 0 ? RTListOff32NodeGetNextCpp(pList, Type, Member) : NULL) + +/** + * Returns the last element in the list (checks for empty list). + * + * @retval Pointer to the last list element. + * @retval NULL if the list is empty. + * + * @param pList List to get the last element from. + * @param Type Structure the list node is a member of. + * @param Member The list node member. + */ +#define RTListOff32GetLast(pList, Type, Member) \ + ((pList)->offPrev != 0 ? RTListOff32NodeGetPrev(pList, Type, Member) : NULL) +/** @copydoc RTListOff32GetLast */ +#define RTListOff32GetLastCpp(pList, Type, Member) \ + ((pList)->offPrev != 0 ? RTListOff32NodeGetPrevCpp(pList, Type, Member) : NULL) + +/** + * Returns the next node in the list or NULL if the end has been reached. + * + * @returns The next node or NULL. + * + * @param pList The list @a pCurNode is linked on. + * @param pCurNode The current node, of type @a Type. + * @param Type Structure the list node is a member of. + * @param Member The list node member. + */ +#define RTListOff32GetNext(pList, pCurNode, Type, Member) \ + ( RTLISTOFF32_NEXT_PTR(&(pCurNode)->Member) != (pList) \ + ? RT_FROM_MEMBER(RTLISTOFF32_NEXT_PTR(&(pCurNode)->Member), Type, Member) : NULL ) +/** @copydoc RTListOff32GetNext */ +#define RTListOff32GetNextCpp(pList, pCurNode, Type, Member) \ + ( RTLISTOFF32_NEXT_PTR(&(pCurNode)->Member) != (pList) \ + ? RT_FROM_CPP_MEMBER(RTLISTOFF32_NEXT_PTR(&(pCurNode)->Member), Type, Member) : NULL ) + +/** + * Returns the previous node in the list or NULL if the start has been reached. + * + * @returns The previous node or NULL. + * + * @param pList The list @a pCurNode is linked on. + * @param pCurNode The current node, of type @a Type. + * @param Type Structure the list node is a member of. + * @param Member The list node member. + */ +#define RTListOff32GetPrev(pList, pCurNode, Type, Member) \ + ( RTLISTOFF32_PREV_PTR(&(pCurNode)->Member) != (pList) \ + ? RT_FROM_MEMBER(RTLISTOFF32_PREV_PTR(&(pCurNode)->Member), Type, Member) : NULL ) +/** @copydoc RTListOff32GetPrev */ +#define RTListOff32GetPrevCpp(pList, pCurNode, Type, Member) \ + ( RTLISTOFF32_PREV_PTR(&(pCurNode)->Member) != (pList) \ + ? RT_FROM_CPP_MEMBER(RTLISTOFF32_PREV_PTR(&(pCurNode)->Member), Type, Member) : NULL ) + +/** + * Enumerate the list in head to tail order. + * + * @param pList List to enumerate. + * @param pIterator The iterator variable name. + * @param Type Structure the list node is a member of. + * @param Member The list node member name. + */ +#define RTListOff32ForEach(pList, pIterator, Type, Member) \ + for (pIterator = RTListOff32NodeGetNext(pList, Type, Member); \ + !RTListOff32NodeIsDummy(pList, pIterator, Type, Member); \ + pIterator = RT_FROM_MEMBER(RTLISTOFF32_NEXT_PTR(&(pIterator)->Member), Type, Member) ) +/** @copydoc RTListOff32ForEach */ +#define RTListOff32ForEachCpp(pList, pIterator, Type, Member) \ + for (pIterator = RTListOff32NodeGetNextCpp(pList, Type, Member); \ + !RTListOff32NodeIsDummyCpp(pList, pIterator, Type, Member); \ + pIterator = RT_FROM_CPP_MEMBER(RTLISTOFF32_NEXT_PTR(&(pIterator)->Member), Type, Member) ) + + +/** + * Enumerate the list in head to tail order, safe against removal of the + * current node. + * + * @param pList List to enumerate. + * @param pIterator The iterator variable name. + * @param pIterNext The name of the variable saving the pointer to + * the next element. + * @param Type Structure the list node is a member of. + * @param Member The list node member name. + */ +#define RTListOff32ForEachSafe(pList, pIterator, pIterNext, Type, Member) \ + for (pIterator = RTListOff32NodeGetNext(pList, Type, Member), \ + pIterNext = RT_FROM_MEMBER(RTLISTOFF32_NEXT_PTR(&(pIterator)->Member), Type, Member); \ + !RTListOff32NodeIsDummy(pList, pIterator, Type, Member); \ + pIterator = pIterNext, \ + pIterNext = RT_FROM_MEMBER(RTLISTOFF32_NEXT_PTR(&(pIterator)->Member), Type, Member) ) +/** @copydoc RTListOff32ForEachSafe */ +#define RTListOff32ForEachSafeCpp(pList, pIterator, pIterNext, Type, Member) \ + for (pIterator = RTListOff32NodeGetNextCpp(pList, Type, Member), \ + pIterNext = RT_FROM_CPP_MEMBER(RTLISTOFF32_NEXT_PTR(&(pIterator)->Member), Type, Member); \ + !RTListOff32NodeIsDummyCpp(pList, pIterator, Type, Member); \ + pIterator = pIterNext, \ + pIterNext = RT_FROM_CPP_MEMBER(RTLISTOFF32_NEXT_PTR(&(pIterator)->Member), Type, Member) ) + + +/** + * Enumerate the list in reverse order (tail to head). + * + * @param pList List to enumerate. + * @param pIterator The iterator variable name. + * @param Type Structure the list node is a member of. + * @param Member The list node member name. + */ +#define RTListOff32ForEachReverse(pList, pIterator, Type, Member) \ + for (pIterator = RTListOff32NodeGetPrev(pList, Type, Member); \ + !RTListOff32NodeIsDummy(pList, pIterator, Type, Member); \ + pIterator = RT_FROM_MEMBER(RTLISTOFF32_NEXT_PTR(&(pIterator)->Member), Type, Member) ) +/** @copydoc RTListOff32ForEachReverse */ +#define RTListOff32ForEachReverseCpp(pList, pIterator, Type, Member) \ + for (pIterator = RTListOff32NodeGetPrevCpp(pList, Type, Member); \ + !RTListOff32NodeIsDummyCpp(pList, pIterator, Type, Member); \ + pIterator = RT_FROM_CPP_MEMBER(RTLISTOFF32_PREV_PTR(&(pIterator)->Member), Type, Member) ) + + +/** + * Enumerate the list in reverse order (tail to head). + * + * @param pList List to enumerate. + * @param pIterator The iterator variable name. + * @param pIterPrev The name of the variable saving the pointer to + * the previous element. + * @param Type Structure the list node is a member of. + * @param Member The list node member name. + */ +#define RTListOff32ForEachReverseSafe(pList, pIterator, pIterPrev, Type, Member) \ + for (pIterator = RTListOff32NodeGetPrev(pList, Type, Member), \ + pIterPrev = RT_FROM_MEMBER(RTLISTOFF32_NEXT_PTR(&(pIterator)->Member), Type, Member); \ + !RTListOff32NodeIsDummy(pList, pIterator, Type, Member); \ + pIterator = pIterPrev, \ + pIterPrev = RT_FROM_MEMBER(RTLISTOFF32_NEXT_PTR(&(pIterator)->Member), Type, Member) ) +/** @copydoc RTListOff32ForEachReverseSafe */ +#define RTListOff32ForEachReverseSafeCpp(pList, pIterator, pIterPrev, Type, Member) \ + for (pIterator = RTListOff32NodeGetPrevCpp(pList, Type, Member), \ + pIterPrev = RT_FROM_CPP_MEMBER(RTLISTOFF32_NEXT_PTR(&(pIterator)->Member), Type, Member); \ + !RTListOff32NodeIsDummyCpp(pList, pIterator, Type, Member); \ + pIterator = pIterPrev, \ + pIterPrev = RT_FROM_CPP_MEMBER(RTLISTOFF32_NEXT_PTR(&(pIterator)->Member), Type, Member) ) + + +/** + * Move the given list to a new list header. + * + * @param pListDst The new list. + * @param pListSrc The list to move. + */ +DECLINLINE(void) RTListOff32Move(PRTLISTOFF32NODE pListDst, PRTLISTOFF32NODE pListSrc) +{ + if (!RTListOff32IsEmpty(pListSrc)) + { + PRTLISTOFF32NODE pFirst = RTLISTOFF32_NEXT_PTR(pListSrc); + PRTLISTOFF32NODE pLast = RTLISTOFF32_PREV_PTR(pListSrc); + + RTLISTOFF32_SET_NEXT_PTR(pListDst, pFirst); + RTLISTOFF32_SET_PREV_PTR(pListDst, pLast); + + /* Adjust the first and last element links */ + RTLISTOFF32_SET_NEXT_PTR(pLast, pListDst); + RTLISTOFF32_SET_PREV_PTR(pFirst, pListDst); + + /* Finally remove the elements from the source list */ + RTListOff32Init(pListSrc); + } +} + +/** + * List concatenation. + * + * @returns nothing. + * @param pListDst The destination list. + * @param pListSrc The source list to concatenate. + */ +DECLINLINE(void) RTListOff32Concatenate(PRTLISTOFF32ANCHOR pListDst, PRTLISTOFF32ANCHOR pListSrc) +{ + if (!RTListOff32IsEmpty(pListSrc)) + { + PRTLISTOFF32NODE pFirstSrc = RTLISTOFF32_NEXT_PTR(pListSrc); + PRTLISTOFF32NODE pLastSrc = RTLISTOFF32_PREV_PTR(pListSrc); + PRTLISTOFF32NODE pLastDst = RTLISTOFF32_PREV_PTR(pListDst); + + RTLISTOFF32_SET_NEXT_PTR(pLastDst, pFirstSrc); + RTLISTOFF32_SET_PREV_PTR(pFirstSrc, pLastDst); + + RTLISTOFF32_SET_NEXT_PTR(pLastSrc, pListDst); + RTLISTOFF32_SET_PREV_PTR(pListDst, pLastSrc); + + /* Finally remove the elements from the source list */ + RTListOff32Init(pListSrc); + } +} + +/** @} */ +RT_C_DECLS_END + +#endif /* !IPRT_INCLUDED_list_off32_h */ + |